Hvac duct size calculator excel.
Commercial kitchen hood exhaust duct size.
Minimum duct size of 7 recommended duct size of 8 10.
The general size and rule of thumb for mua is a 6 hood or larger or 2000 cfm or more of exhaust flow.
State of the art stainless steel grease duct systems are nfpa 96 compliant designed to safely convey grease laden vapors from commercial kitchen cooking equipment.
The difference between the inside cross sectional dimensions of overlapping sections of duct shall not exceed 1 4 inch 6 4 mm.
Note that not both exhaust fans are required for hood exhaust.
A 0 to 400 cfm fan requires a 4 inch minimum duct size but a 6 inch duct is recommended.
So if you have a 30 wide stove you would need a range hood with a fan that moves at least 250 cfm of air.
The minimum duct sizes and recommended duct sizes based on a hood fan s cfm rating are as follows.
Minimum duct size of 6 recommended duct size of 8 601 900 cfm.
With the calculation sheets below you will be able to design the kitchen hoods according to ashrae and greenheck.
The length of overlap for overlapping duct joints shall not exceed 2 inches 51 mm.
The basic rule of thumb when determining the fan size of a range hood is that it should move a minimum of 100 cfm of air for every 12 of stove width.
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These excel programs are used in sizing exhaust hoods air volume flow and capture velocities free exhaust hood calculator.
16 2 please refer to the duct diameter sizing chart by hood size and cfms.
Minimum duct size of 4 recommended duct size of 6 401 600 cfm.
The illustration above shows a typical commercial kitchen application utilizing a roof mount upblast exhaust fan or wall mount upblast exhaust fan in conjunction with a supply fan.
Excel sheets for the design of and sizing of kitchen hoods.
View the kitchen exhaust duct sizing chart below to determine your ductwork diameter based on range hood cfm.
2 5 wide stove x 100 250 cfm minimum range hood fan size.
The information presented is applicable to new construction and in many instances retrofit construction.
This design guide reviews the fundamentals of kitchen.
Read on to determine how to size your exhaust and supply fans.